Ryan O'Neal is not allowed to visit his son Redmond O'Neal in rehab.
The 68-year-old actor has been reportedly stopped from seeing his son - who he had with the late actress Farrah Fawcett - whilst he is staying in a residential treatment centre for substance abuse problems.
Ryan O'Neal is making a second documentary about Farrah Fawcett's cancer battle.
The actor has commissioned a producer to work on a "tribute" show to his long-term partner - who died last June - and a film crew has been in the 'Charlie's Angels' star's home state of Texas to shoot a series of one-on-one interviews with her friends and family.
Farrah Fawcett's friends were reportedly "shut out" and banned from seeing her before she died.
The 'Charlie's Angels' actress - who lost her battle with cancer last June - was "controlled" by her long term partner Ryan O'Neal and friend Alana Hamilton Stewart, one of her closest pals has claimed.
Redmond - the son of Ryan O'Neal and the late Farrah Fawcett - was arrested on December 29 on a felony drug charge and a judge ordered him to return to an in-custody drug treatment centre for breaking his probation terms.
Farrah Fawcett's last living trust omitted long-term partner Ryan O'Neal.
The 'Charlie's Angels' actress - who lost her battle with cancer in June aged 62 - reportedly left $4.5 million to son Redmond O'Neal and $100,000 to ex-boyfriend Greg Lott, who has recently claimed he was the star's secret boyfriend but had been banned from seeing her by Ryan.